Nadir YILDIRIM, Mehmet Emin ERGÜN, Ertan ÖZEN, Berk DALKILIÇ

Odun lifi takviyeli polivinil asetat rijit köpüklerin üretimi

Bu çalışmada, dondur-kurut tekniği kullanılarak tasarlanmış ve üretilmiş rijit köpükler polivinil asetattan (PVAc), ağartılmış kraft hamurundan ve ağartılmamış kraft hamurundan yapılmıştır. Rijit köpük çevre dostu bir ürün olarak üretim aşamasında pentan veya hidrokloroflorokarbon içermemektedir. PVAc bazlı köpük farklı oranlarda kraft hamuru ile güçlendirilmiştir. Basınç, eğilme kuvvetleri, fiziksel ve morfolojik özellikleri gibi performans özellikleri ilgili standartlara göre incelenmiştir. Köpük yoğunlukları %17,65 varyasyon katsayısı (CV) ile 0,018 g/cm3ve %2,33 CV ile 0,137 g/cm3 arasında değişmektedir. Basınç direnci %50,00 CV ile 0,001 N/mm2 ve %5,98 CV ile 0.03 N/mm2arasında değişmektedir. Eğilme direnci ise %20,00 CV ile 0,005 N/mm2 ve %6,06 CV ile 0,11 N/mm2arasında bulunmuştur. Optimum özellikler B-4’ten (PVAc/Ağartılmış Kraft hamuru 1/0.8) elde edilmiştir. Ağartılmış kraft hamur takviyesi, ağartılmamış kraft hamur takviyesine kıyasla köpük malzemenin performans özellikleri üzerinde daha iyi sonuçlar vermiştir. Tüm test sonuçlarına göre PVAc bazlı rijit köpüğün umut verici sonuçlar sergilediği gözlenmiştir.

Manufacture of wood fiber reinforced polyvinyl acetate rigid foams

In this work, rigid foams designed and manufactured using the freezedrying technique were made from polyvinyl acetate (PVAc), bleachedkraft pulp and unbleached kraft pulp. The rigid foams designed asan environmentally-friendly product with no pentane or hydrochlorofluorocarbon included in the manufacturing process. The PVAcbased foams were reinforced with different kraft pulp contents. Theirperformance properties such as compressive and flexural strength,physical and morphological properties were investigated according torelevant standards. The foam densities ranged from 0,017 g/cm3 with%17,65 coefficient of variation (CV) to 0,137 g/cm3 with %2,33 CV.The compression resistance was found between 0,001 N/mm2 with%50,00 CV and 0,03 N/mm2 with %5,98 CV. The flexural resistancewas found between 0,005 N/mm2 with %20,00 CV and 0,11 N/mm2with %6,06 CV. Optimum properties were observed at B-4 (PVAc/Bleached Kraft pulp 1/0.8). Bleached kraft pulp reinforcement gavebetter results on performance characteristics of foam materials compared to unbleached kraft pulp reinforcement. Overall test resultsshowed that the PVAc based rigid foams have promising results.

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